Development and Validation of UV Spectrophotometric Method for Simultaneous Estimation of Hydrochlorothiazide and Lisinopril in Bulk Drug and Its Formulations

A simple, efficient, precise and accurate Vierodt's method have been developed for the estimation of Hydrochlorothiazide and Losartan potassium in pure and in fixed dose Combination. In this method UV spectrum of Hydrochlorothiazide and Losartan potassium were overlained which involves the formation of Simultaneous equation at maximum wavelength 274 nm and 234 nm. Both the drugs obeyed Beer's law in the concentration range 5–20 μg/ml and 1–10 μg/ml for Hydrochlorothiazide and Losartan potassium, respectively. The accuracy of the method was determined by recovery studies and was found to be in the range of 102.29–103.10% and 99.52–101.60% for Hydrochlorothiazide and Losartan potassium, respectively. The method was validated as per ICH guidelines and statically. The method showed good reproducibility and recovery with % RSD less than 2. The method was found to be simple, economic, accurate and reproducible and can be used for routine analysis of Hydrochlorothiazide and Losartan potassium in pure and in fixed dose combination.